Safari is a free web browser for both Mac and Windows PC. It is developed by Apple Inc. and is currently in its 4th version. THe browser is made based on Apple's own WebKit webpage rendering engine, of which was developed based on Konqueror's KHTML (in the form of WebCore) and KJS (in the form of JSC). Since both KHTML and KJS are open-source, WebKit also has been made open-source as well (under GNU Lesser GPL), allowing 3rd-party software developer to use it for instance, to develop another brand new browser, just like in the case when Netscape source-code was made open-source thus gave birth to Mozilla Firefox. However, some parts like the GUI elements of the software continue to remain as Apple's proprietary.
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For most people, Safari is just yet another web browser. This is true to some extent though, as it shares common notable features with other modern browsers such as tabbed browsing, built-in pop-up blocker, integrated major search engines, spell checker, auto web form filler, feed reader and many more. However, Safari do have some "Safari-only" features like the "Keychain" password manager, Web-Inspector (a DOM Inspector-like utility), iPhoto integration as well as Apple Dashboard integration, where most of them are like some sort of rebadged similar features often found in other major browsers like Mozilla Firefox and Opera. They also usually only benefits Apple-esque web.
The first public release was in 2003, where it was only made available on Mac OS X. A Windows-ported version was only released in 2007. On that time, Safari is already in it's 3rd version. From various unofficial sources on the net, it appears that Windows users has been requesting for a Windows version of Safari, although those requests are made solely for the purpose of "satisfying the geek thirst". In real world application though, performance wise, Safari itself has never been a better browser actually, as it is always at average with other browsers.
The most notable controversy about Apple Safari is Apple's official web browser comparison chart which was publicly displayed on the company's corporate website sometime back in 2004. On that time, Safari was compared with other browsers with the fast browser reputation like Opera and Mozilla Firefox, of which both were already in their 8th and 2nd version respectively. However, surprisingly, Apple used Opera 7 and Firefox 1.5 to make the comparison. This biased and doubtful comparison was seriously offending that it resulted some European and Asian countries banned the advertisement of the software. Some long time Windows users admitted that this was expected because for them, "this is not the first time Apple tells us a lie". Even the more recent comparison still compares Safari with Firefox 2, as if Firefox 3 does not exist. A group of Firefox fans have been mocking about this on the net but there is no official respond from Apple so far (probably because they are eating back their words?). To make it worst, Apple still self-proclaimed Safari as "the world's fastest browser" although they are constantly being confronted by professionals for such false claim. In fact, even the Apple official website sometimes may took ages to be fully loaded when browsed through Safari, especially on first visit (upon first install or cleaned cache/cookies) while Firefox or Opera never really have this problem when visiting there.
Since version 4, Apple has included major changes and revamped around 25% of the interface of the software. It now somehow resembles the Mobile Safari, the iPhone version of Safari. It also support native Windows look for Windows version. There is also a 'CoverFlow' (like the one found in the iTunes) for browsing the history and bookmarks. The JSC engine also has been superseded by SquirrelFish, a new JavaScript engine. Apple, just like Google on Chrome, emphasize heavily on speeding up the JavaScript execution process. Both Google and Apple claimed that this greatly speeds up internet browsing experience, though this will only has significant impact if the website is heavily scripted with JavaScript (which only a fractionof websites do).
Still, despite in version 4, Apple still stubborn (or stupid) enough not to include a pulldown menu button in the addressbar, where this feature has been proven extremely useful in all other browsers. With this feature, user does not need to retype addresses or opening the history just to browsethe previously visited website. Not only that, Safari shares the same flaw with Google Chrome, where it can only recognize the first few letters of a typed URL in the address bar in order to suggest the previously opened URLs. Firefox and Opera are much better in this, where both browsers will suggest any previously visited URLs if the user only typing the 2nd level domain of a URL or even the sub-page URL.
Safari still have lots of rooms for improvements, and it would be better if they (Apple) would consider to tend to any kind of complaints regarding this browser. No, we are not asking them to make Safari as "another Firefox" but just want them to properly implement 'proven-useful' features. It is pointless to be different where in fact you are just being bad.
Download Safari for free here:
http://www.apple.com/safari/download/